Are you THIS mad at me?

Will went Uga in his pants the other morning. He asked if I was really mad at him, and I told him no, only a little mad that he went in his pants and didn't tell me he had to go. So then he said, "Are you this mad at me?" I repeated my answer. Then he asked me again, "Are you this mad at me?" I was like, what the heck does "this" mad mean? Then I realized what he was doing with his face...
Apparently that is the face I make when I am really mad!